KR102437576B1 - Dispersion for water purification, method for producing the dispersion for water purification, and method for treating wastewater - Google Patents

Abstract

It is a dispersion liquid for water purification containing water and containing 0.01% by mass to 0.5% by mass of a combination of the powder of long jute and a polymer flocculant with respect to the water,
A water purification dispersion having a viscosity of 20 mPa·S to 500 mPa·S and a median diameter of solid content in the dispersion for water purification of 100 μm to 400 μm.

Description

Dispersion for water purification, method for producing the dispersion for water purification, and method for treating wastewater

The present invention relates to a plant-derived dispersion for purifying water used for purifying water such as industrial wastewater, a method for producing the dispersion for purifying water, and a wastewater treatment method using the dispersion for purifying water.

In recent years, in the process of manufacturing various products in a factory, the waste liquid containing environmental load substances, such as a metal ion and a fluorine ion, as an inorganic ion, is generate|occur|produced in large quantity.

On the other hand, regulations regarding the emission of these inorganic ions are becoming increasingly strict. In order to comply with this emission regulation, a method for removing inorganic ions that can effectively remove inorganic ions from wastewater containing inorganic ions and can be carried out as simply as possible and at low cost is required.

Conventionally, as a method for removing impurity ions from factory wastewater or the like, a coagulation precipitation method, an ion exchange method, an adsorption method to an adsorbent such as activated carbon, an electro-adsorption method, a magnetic adsorption method, and the like have been proposed.

For example, as a coagulation precipitation method, a base is added to the wastewater in which heavy metal ions are dissolved, the wastewater is made basic, at least a part of the heavy metal ions are insolubilized to form a suspended solid, and an inorganic coagulant is added to the wastewater. An adsorption layer containing a cation exchanger including leaves such as moloheiya and green leafy greens, a step of coagulation and sedimentation of the suspended solids by addition, a step of adding a polymer flocculant to the wastewater to make the suspended solids into large flocks, The method of performing the adsorption|suction process of passing wastewater through to is proposed (for example, refer patent document 1).

Further, there has been proposed a coagulation method in which fine particles in suspension are coagulated and separated by mixing or using a coagulant containing at least any one of Moloheiya, a dried product thereof, or an extract thereof, and a polymer flocculant (for example, Patent Documents) see 2).

Further, a water purification agent comprising a granulated product containing a mixture of plant powder and a polymer flocculant, and a water purification method using the water purification agent have been proposed (for example, refer to Patent Document 3).

By the way, when performing the wastewater purification process stably at high speed, introduction of the automatic purification apparatus which can automatically perform the wastewater purification process is indispensable. In particular, in order to perform a large amount of wastewater treatment, an automated purification apparatus is an effective means. Therefore, in the use of an automated purification apparatus, it is desired to construct a system for purification processing that can perform purification processing for a large amount of wastewater stably at high speed and exhibits more excellent purification performance.

Japanese Patent Laid-Open No. 2011-194385 Japanese Patent Laid-Open No. 11-114313 Japanese Patent Laid-Open No. 2016-73898

In the automatic purification apparatus, in the case of purifying wastewater using the plant-containing water purification agent described in Patent Documents 1 to 3, in order to exhibit excellent water purification performance, when the water purification agent is provided to the wastewater, A method of dissolving a water purifying agent in water once to prepare a dispersion, and providing such a dispersion to drainage is considered. This is because it is preferable to use a dispersion to widely spread the water purification component throughout the drainage, rather than directly injecting the solid water purification agent into the drainage.

In addition, according to the line production method, it is necessary to prepare a dispersion to purify the wastewater during efficient flow operation. This is because the amount of wastewater discharged from factories, etc., often changes from day to day, so it is required to prepare and store a certain amount of the dispersion in advance, and to use the required amount when necessary.

In addition, when customer needs are taken into consideration, it is considered to be traded as a dispersion in which a water purification agent is dissolved in water, and a certain demand is expected for the aspect as a dispersion. Therefore, it is desired to provide a dispersion liquid capable of being stored for a long time at a low cost.

However, in neither of Patent Documents 1 to 3, a detailed description is given regarding the dispersion to be used for drainage, and from the description of Patent Documents 1 to 3, as a dispersion in which a water purification agent is dispersed in water for supply to drainage, It was not possible to prepare a dispersion liquid that exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and can also satisfy low cost.

An object of the present invention is to solve the above problems and achieve the following objects. That is, an object of the present invention is to provide a dispersion for water purification that exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and can also satisfy low cost.

As a solution to the said subject, it is as follows. in other words,

It is a dispersion liquid for water purification containing <1> water, and containing 0.01% by mass to 0.5% by mass of a mixture of a long jute powder and a polymer flocculant with respect to the water,

A water purification dispersion having a viscosity of 20 mPa·S to 500 mPa·S and a median diameter of solid content in the dispersion for water purification of 100 μm to 400 μm.

<2> The above-mentioned Jangshak jute is the dispersion for water purification according to <1>, in which the identification number by the Maru Research Institute of the Chinese Academy of Agricultural Sciences is "Jute 4" of the National Gamma 2013.

<3> The above-mentioned Jangshak jute is the dispersion liquid for water purification according to <1>, wherein the evaluation number by the Maru Research Institute of the Chinese Academy of Agricultural Sciences is "Medium Jute No.

<4> The above-mentioned Jangshak jute is the dispersion for water purification according to the above <1>, in which the evaluation number by the Maru Research Institute of the Chinese Academy of Agricultural Sciences is "Chonghongma" of Hwanpung Gamjiro No. 1209001.

<5> The dispersion for water purification according to any one of <1> to <4>, wherein the polymer coagulant is polyacrylamide.

<6> The dispersion for water purification according to any one of <1> to <5>, wherein the mass composition ratio of the long-cut jute and the polymer flocculant is 9:1 to 1:9.

<7> The dispersion for water purification according to any one of <1> to <6>, wherein the viscosity is 150 mPa·S to 450 mPa·S.

<8> The dispersion for water purification according to any one of <1> to <7>, wherein the median diameter is 150 µm to 350 µm.

<9> A method for producing a dispersion for water purification, wherein the dispersion for water purification according to any one of <1> to <8> is prepared, the method comprising:

A kneading process of mixing the powder of the long-cut jute and the polymer coagulant, adding moisture and kneading to obtain a kneaded product, a molding step of molding the kneaded material to form a compact, and drying the compact to obtain a dried product A method for producing a dispersion for water purification, characterized in that the powder of the water purification agent produced by a production method comprising a drying step to obtain and a grinding step of pulverizing the dried product is dispersed in water to prepare the dispersion for water purification .

<10> The method for producing a dispersion for water purification according to <9>, wherein the electrical conductivity of water used for dispersion is 30 µS/cm or more.

<11> It is a wastewater treatment method characterized by removing inorganic unnecessary substances in wastewater by providing wastewater with the dispersion liquid for water purification in any one of said <1>-<8>.

<12> The wastewater treatment according to <11>, wherein the wastewater is wastewater containing an inorganic unnecessary substance having at least any one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. way.

<13> The wastewater treatment method according to <12>, wherein the dispersion for water purification is provided to wastewater after 24 hours or more have elapsed after production.

ADVANTAGE OF THE INVENTION According to this invention, the said various problems in the prior art can be solved, and the said objective can be achieved, and excellent water purification performance is shown, water purification performance is not reduced even after long-term storage, and low cost can be satisfied. A dispersion for water purification can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the judgment number of "heavy jute No. 3" used by this invention.
Fig. 2 is a diagram showing the identification number of "Chonghongma" used in the present invention.

(Dispersion for water purification)

The dispersion for water purification of the present invention contains a powder of long-sharpened jute and a polymer coagulant. That is, the powder of long-sharpened jute and the polymer coagulant are dispersed in water.

In the dispersion liquid for water purification, the content of the powder of long jute and the polymer flocculant is 0.01% by mass to 0.5% by mass with respect to the water serving as the dispersion medium.

The viscosity of the dispersion for water purification is 20 mPa·S to 500 mPa·S.

Moreover, the median diameter of the solid content in the said dispersion liquid for water purification is 100 micrometers - 400 micrometers.

The dispersion for water purification of the present invention satisfying the above requirements becomes a dispersion for water purification that exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and can also satisfy low cost.

The inventors of the present inventors have repeatedly studied the purification treatment of wastewater using the dispersion, and found that the viscosity of the dispersion changes when the plant powder and the polymer flocculant are dissolved depending on the type of water in the dispersion. In addition, it was found that the viscosity of the dispersion tends to decrease in the case of using long-haired jute as the plant powder.

Then, it was found that the difference in viscosity of the dispersion affects the purification performance of wastewater, and that in order to obtain good purification performance, it is necessary to increase the viscosity of the dispersion to some extent.

In addition, when the viscosity is low, the solid content in the dispersion tends to settle. Therefore, after, for example, several days have elapsed after the dispersion has been prepared, the ingredients effective for water purification are deposited on the bottom of the container, so they remain in the container when poured into the water sump, and as a result, sufficient water purification action is not obtained. . This phenomenon was particularly remarkable when tap water (containing various ions) or groundwater was used in the preparation of the dispersion. When expensive distilled water is used as the dispersion medium, the problem of viscosity can be dealt with to some extent, but the problem of cost arises.

Practically, the dispersion liquid for water purification provided in the sump is on a scale of several tens to several hundreds of L. Therefore, the dispersion liquid for water purification is stored, for example, in a drum or the like having a capacity of about 200 L. In this case, the problem of the above-mentioned solid content sedimentation, which occurs when the viscosity of the dispersion for water purification is low, becomes significant. However, when the dispersion for water purification is put into a water tank immediately (for example, within a few minutes) after production, the above-mentioned solid content sedimentation rarely becomes a problem. However, the amount of wastewater generated varies from day to day in many cases, so it is practical to prepare and store a certain amount of the dispersion in advance and use the required amount when necessary. Therefore, there is a demand for a dispersion liquid for water purification in which sedimentation of solid content is suppressed even after long-term storage.

Therefore, as a result of intensive studies, the inventors of the present invention, by defining the content of the long jute powder and the polymer flocculant in the dispersion, the median diameter of the solid content in the dispersion, and the viscosity of the dispersion, the dispersion whose values are in the desired range is in the drainage It has been found that a water purification dispersion capable of suppressing sedimentation of solid content even after long-term storage while maintaining a good purification action against water purification, and of which water purification performance does not deteriorate even when relatively inexpensive tap water or groundwater is used.

Hereinafter, the specific structure of the dispersion liquid for water purification is demonstrated.

<Powder of Long Shak Jute>

The powder of the long-cut jute can be preferably used because it has a high cation exchange function and has pores capable of adsorbing microflocs in the wastewater containing the inorganic ions.

As a site|part of long-haired jute, although any site|part of a leaf, a stem, or a root can be used, the site|part of a leaf can be used preferably.

In addition, among Jangshak jute, Changsha jute from Changsha, China, or "Jung jute 3" whose appraisal number by the Maru Research Institute of the Chinese Academy of Agricultural Sciences is National Gamma 2013, and the appraisal No. No. ', "Jung-Jute No. 1" whose evaluation number is XPD005-2005, or "Jung-Hong Horse" whose evaluation number is Hwanpum Gam-seungja No. 1209001 can be preferably used. Moreover, the said "heavy jute No. 4", the said "medium jute No. 3", and the said "medium jute No. 4" are more preferable, and the said "medium jute No. 4" is especially preferable.

In addition, the evaluation number of the said "heavy jute No. 3" is shown in FIG. The evaluation number of the "Chonghongma" is shown in FIG. 2 .

Said "heavy jute No. 4" has the following characteristics.

Agricultural Product Type: Jute

In order to obtain the plant powder, for example, a dry plant is coarsely pulverized and then finely pulverized to obtain a plant powder having a desired size (eg, number average particle diameter of 400 µm or less).

Moreover, in this invention, what is necessary is just to classify the grind|pulverized powder using a classifier, for example, a vibrating machine, or a wind-beam classifier. Thereby, it can adjust so that the median diameter of the solid content in the said dispersion liquid may become a desired range.

<Polymer Flocculant>

The polymer coagulant is not particularly limited as long as it exhibits the effect of removing the inorganic impurities in the wastewater as in the case of the long-cut jute. For example, polyacrylamide (PAM), partial hydrolysis salt of polyacrylamide , sodium alginate, sodium polyacrylate, CMC sodium salt, and the like. Among these, polyacrylamide can be used preferably. As the polyacrylamide, commercially available Flopan AN 995SH, FA 920SH, FO 4490, AN 923, AN 956 (manufactured by S.N.F, Ltd.), etc. can be used, for example.

<Other additives>

The dispersion for water purification may contain additives such as preservatives, fillers, thickeners, colorants, and thixotropic imparting agents as other additives.

<Characteristics of dispersion for water purification>

<<Content of long-cut jute powder and polymer coagulant>>

Content of the said long-cut jute powder and the said polymer flocculent combined is 0.01 mass % - 0.5 mass % with respect to the water which is a dispersion medium, More preferably, they are 0.05 mass % - 0.3 mass %.

In addition, the mixing ratio of the powder of the long-cut jute and the polymer coagulant may be 9:1 to 1:9 by mass ratio.

<<Viscosity of dispersion for water purification>>

The viscosity of the dispersion for water purification is 20 mPa·S to 500 mPa·S, more preferably 100 mPa·S to 450 mPa·S, and particularly preferably 150 mPa·S to 450 mPa·S.

When the viscosity is lower than 20 mPa·S, the solid content precipitates in the dispersion.

On the other hand, when it is higher than 500 mPa·S, the mixed state with wastewater is disturbed, and the water purification performance is not sufficiently exhibited.

The said viscosity is a value in the temperature at the time of storage, and is usually about 5-30 degreeC. More preferably, it is about room temperature (around 23 degreeC).

The said viscosity can be measured with the No. 1 rotor under 23 degreeC of room temperature using the TVC-7 type|mold viscometer (B type|mold viscometer) by Toki Sangyo.

<<Median diameter of solid content in dispersion for water purification>>

The median diameter of the solid content in the dispersion for water purification is 100 µm to 400 µm, more preferably 150 µm to 350 µm.

When the median diameter of the solid content is smaller than 100 µm, the water purification function becomes insufficient. On the other hand, when it is larger than 400 micrometers, solid content will precipitate in a dispersion liquid.

The solid matter in the dispersion is mainly affected by the powder insoluble content of long-cut jute. Accordingly, in order to bring the median diameter into the desired range, the grinding conditions of the long-cut jute may be adjusted, the powder of the long-cut jute obtained by grinding may be classified, or the related classification conditions may be adjusted. Alternatively, when producing a granulated product containing a mixture of a long-cut jute powder and a polymer flocculant, the grinding conditions of the granulated product are adjusted, the powder of the granulated product obtained by pulverization is classified, or the related classification conditions are adjusted. do.

In the present invention, by performing both steps of the step of classifying the powder of long-cut jute and the step of classifying the powder of the granulated material containing the powder of long-cut jute and the polymer coagulant, the median diameter of the solid content is adjusted to be in the desired range. it is preferable

Here, the median diameter (also referred to as d50) refers to the particle diameter plotted as 50% of the total number when the solid content is plotted as the particle diameter size (the particle diameter in which the large particle diameter side and the small particle diameter side are equal to each other) ) says

The median diameter of the solid content in the dispersion liquid can be measured by diluting the dispersion liquid sample 10 times and using a Morphology G3 measuring instrument manufactured by Malvern (Spectris Co., Ltd.).

(Method for preparing dispersion for water purification)

The method for producing the dispersion for water purification of the present invention (hereinafter also referred to as the production method of the present invention) includes a dispersion step of dispersing the powder of long-sharpened jute and a polymer flocculant in water so as to obtain the dispersion for water purification of the present invention described above. .

In this case, as long as the obtained dispersion for water purification satisfies the above-mentioned <characteristics of dispersion for water purification>, there is no particular limitation on the method of dispersing the powder of long jute and the polymer flocculant, for example, powder of long jute and The dispersion for water purification can be obtained by separately dispersing the polymer flocculant in water. However, in this case, in order to set it as a desired viscosity, it may be necessary to use distilled water as a dispersion medium. Therefore, it is not limited to the kind of dispersion medium (water), and in order to obtain the dispersion liquid for water purification of this invention, it is more preferable to set it as the following form.

In other words, rather than dispersing the powder of long-cut jute and the polymer flocculant separately in water, first, a water purification agent containing the powder of long-cut jute and the polymer flocculant is prepared, and the powder of this water purification agent is dispersed in water to disperse the water purification solution. It is more preferable to obtain

As said water purification agent, it is preferable that it is a water purification agent containing the granulated material obtained by the powder of long-haired jute kneading|mixing a polymer flocculant. For example, the water purification agent includes a kneading process of mixing the powder of the long-cut jute and the polymer coagulant, adding moisture and kneading to obtain a kneaded product, a molding process of molding the kneaded material to form a molded product, , a drying step of drying the molded product to obtain a dried product, and a pulverizing step of pulverizing the dried product.

Moreover, it is preferable that the classification process of classifying a granulated material with a sieve is included after the said grinding|pulverization process.

In the said shaping|molding process, the said kneaded material is shape|molded by arbitrary shaping|molding methods, for example, and a molded object is formed.

In the said drying process, what is necessary is just to dry the obtained molded object at the temperature of 80 degreeC - 150 degreeC for 2 hours - 12 hours using, for example, a multistage hot-air dryer.

What is necessary is just to dry the said molded object and to use for a grinding|pulverization process when the moisture content of a molded object becomes about 30 %, for example.

In addition, although it is a preferable aspect that the said drying process is applied in the procedure of drying the molded object obtained by the shaping|molding process, and then grind|pulverizing the dried molded object, for example, grind|pulverize the molded object obtained in the shaping|molding process, and then dry You may carry out in the procedure of obtaining a granulated material by implementing a process.

In the pulverization step, pulverization may be performed using a pulverizer, for example, an airflow ultrafine pulverizer.

In the classification step, the pulverized powder is subjected to a classifier, for example, a vibrating machine or a wind-bearing classifier, and the classification conditions may be adjusted so that the median diameter of the solid content in the dispersion for water purification is within a desired range.

As described above, the dispersion for water purification obtained by once producing a water purification agent and dispersing the powder of this water purification agent in water is not particularly limited as a dispersion medium (water), and, in addition to pure water (distilled water), has an electrical conductivity of 30 µS Water above /cm can be used. Even when these dispersion mediums are used, a desired viscosity is obtained. Thereby, relatively inexpensive tap water or groundwater can be used.

Even if tap water or groundwater is used for the dispersion, the concentration of inorganic ions in the wastewater can be reduced to a desired concentration or less, thereby exhibiting high water purification performance. Moreover, even if it is stored for a long time, sedimentation of the solid content in a dispersion liquid can be suppressed.

(Drainage treatment method)

The wastewater treatment method of the present invention is to remove inorganic unnecessary substances in wastewater by providing the above-described dispersion for water purification of the present invention to wastewater.

Examples of the inorganic unnecessary material include inorganic unnecessary materials containing at least any one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, and lead.

By using the dispersion for water purification of the present invention, sedimentation of the solid content in the dispersion for water purification is suppressed even after long-term storage, so that excellent water purification performance can be exhibited even after long-term storage. Therefore, it is not necessary to immediately provide the dispersion for water purification after preparation, and even if it is provided to the drain after 24 hours or more, excellent water purification performance can be exhibited.

The wastewater treatment method of this invention is demonstrated concretely.

For example, the dispersion for water purification obtained by the production method of the present invention is added after the insolubilization step of adding a base to the wastewater, making the wastewater basic, insolubilizing at least a part of the heavy metal ions to form a suspended solid. can do.

By providing the dispersion for water purification in a ratio of 0.5 ppm to 15 ppm with respect to the wastewater, the wastewater is purified by coagulating and sedimenting inorganic impurities and removing the sediment separated by sedimentation.

Example

Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples at all.

(Example 1)

As waste water used for experiments, nickel sulfate hexahydrate was dissolved in pure water to prepare 800 g of an aqueous solution containing 50 mg/L nickel ions (virtual drainage).

Then, caustic soda was supplied to the drain to a pH of 10 and stirred to insolubilize nickel. The supernatant nickel ion concentration of the wastewater was 2 mg/L.

<Water Purifier>

Then, as a plant, Zhangshak jute (manufactured in Guangzhou, China) was used as a polymer coagulant and polyacrylamide (PAM) was used.

Plants are dried in the sun until the moisture content is 5% by mass or less, and then pulverized with an atomizer (hammer mill, manufactured by Masco Sangyo Co., Ltd.), and a particle diameter is in the range of 100 µm to 400 µm In order to use only those that fit inside the sieve, those smaller than 100 µm and larger than 400 µm were removed (cut) through a sieve.

The granulated material 1 was obtained by the manufacturing method shown below, and this granulated material 1 was used as the water purification agent 1.

<<Method for manufacturing water purification agent>>

A kneaded product (plant powder + polymer flocculant + water = 30 kg) obtained by adding water 5 times the mass of the combined solid content of the plant powder and the polymer flocculant was mixed with a planetary mixer (manufactured by Aikosha, Ltd., Mixer ACM-110, capacity 110L), and kneaded by shaking under the conditions of rotation speed of 150rpm and mixing for 20 minutes.

The obtained kneaded material was shape|molded, and the molded object was produced.

This molded object was dried at 120 degreeC for 3 hours and 150 degreeC for 2 hours using the multistage hot-air dryer (The Shichiyo Co., Ltd. make, rack-type oven apparatus).

Next, the dried compact was pulverized to a median diameter of 400 µm using an airflow ultrafine pulverizer (Selenium Mirror manufactured by Masco Sangyo Co., Ltd.).

In addition, the median diameter was measured by Mastersizer 2000 (made by Malvern Instruments).

Using a classifier (vibrating sieve machine manufactured by Tsukasa Kogyo Co., Ltd.), the pulverized powder was removed by sieving so that only those having a particle diameter within the range of 150 µm to 850 µm were used. (cut).

In this way, the granulated product 1 was obtained and it was set as the water purification agent 1.

<Dispersion>

To this water purification agent 1, water (tap water, Kanuma-shi, Tochigi) having an electrical conductivity of 110 µS/cm 3 was added and stirred to obtain a solid content of 0.1% by mass, and dispersion liquid 1 was obtained.

In the manner described above, the viscosity of the dispersion 1 and the median diameter of the solid content in the dispersion were measured.

<Characteristic evaluation>

The dispersion liquid 1, an open type drum having a capacity of 200 L was filled with 180 L.

After leaving it to stand in the dark at 23 degreeC for a predetermined time, the lid of the drum was removed, and the presence or absence of sedimentation was confirmed visually.

Then, the dispersion liquid 1 containing the water purification agent 1 was added so that the solid content might be 7 mg/L with respect to the said waste_water|drain, and it stirred. Here, the measuring method of "solid content" can be calculated|required by measuring the slurry density|concentration in waste_water|drain with a water meter, and calculating back.

The wastewater to which the dispersion liquid 1 was added was transferred to the settling tank, and thereafter, it was left still and the state was checked visually every hour.

The time point at which it was confirmed that the supernatant and the precipitate were clearly divided into two layers was measured as the settling time.

In addition, the supernatant was collected, and the ion concentration was measured by Lambda (Λ) 9000 (manufactured by Kyoritz Rikagaku Co., Ltd.).

As a result, the water purification performance was evaluated according to the following criteria.

[Evaluation criteria for water purification performance]

◎: less than 1.0 mg/L (less than the detection limit)

○: 1.0 mg/L or more and less than 1.4 mg/L

○△: 1.4 mg/L or more and less than 1.7 mg/L

△: 1.7 mg/L or more and less than 2.0 mg/L

×: 2.0 mg/L or more

The evaluation results of Example 1 are shown in Table 1-1.

In addition, in Table 1-1, plant powder 1 represents long-haired jute (manufactured in Guangzhou, China) and PAM represents polyacrylamide (also in Tables 1-2 to 1-5).

(Example 2)

In Example 1, the same procedure as in Example 1 was carried out, except that, as a plant, the appraisal number by the Maru Research Institute of the Chinese Academy of Agricultural Sciences of Zhangshak jute, Huanfu Persimmon Stirrup No. 1209006, and "Zhongjute No. 3" were used. was produced.

Using the dispersion liquid 2 in which the water purification agent 2 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 2 are shown in Table 1-1. In addition, in Table 1-1, plant powder 2 represents "heavy jute No. 3".

(Example 3)

In Example 2, as a plant, the appraisal number 2013 by the Maru Research Institute of the Chinese Academy of Agricultural Sciences of Zhangshak jute was used. Other than that, it carried out similarly to Example 2, and produced the water purification agent 3.

Using the dispersion liquid 3 in which the water purification agent 3 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 3 are shown in Table 1-1. In addition, in Table 1-1, the plant powder 3 represents "heavy jute No. 4".

(Example 4)

In Example 3, as the plant, Changsha jute was used, "Chunghong horse", the number of which was appraised by the Maru Research Institute of the Chinese Academy of Agricultural Sciences, No. 1209001. Other than that, it carried out similarly to Example 3, and produced the water purification agent 4.

Using the dispersion liquid 4 which disperse|distributed the water purification agent 4 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 4 are shown in Table 1-1. In addition, in Table 1-1, plant powder 4 represents "heavy red horseradish".

(Comparative Example 1)

In Example 3, the dispersion liquid concentration was 0.005 mass %, and except having adjusted the viscosity to 15 mPa*S, it carried out similarly to Example 3, and the comparative water purification agent 1 was produced.

Using the comparative dispersion liquid 1 in which the comparative water purification agent 1 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Comparative Example 1 are shown in Table 1-2.

As a result of the sedimentation in the drum of Comparative Example 1, "presence" was a state in which the bottom of the drum was not seen because of the sediment.

(Example 5)

In Example 3, the dispersion liquid concentration was 0.02 mass %, and except having adjusted the viscosity to 20 mPa*S, it carried out similarly to Example 3, and produced the water purification agent 5.

Using the dispersion liquid 5 which disperse|distributed the water purification agent 5 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 5 are shown in Table 1-2.

As a result of sedimentation in the drum of Example 5, the sediment was seen, but the bottom of the drum was in a state in which "there was a little".

(Example 6)

In Example 3, the dispersion liquid concentration was 0.5 mass %, and except having adjusted the viscosity to 500 mPa*S, it carried out similarly to Example 3, and produced the water purification agent 6.

Using the dispersion liquid 6 which disperse|distributed the water purification agent 6 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 6 are shown in Table 1-2.

(Comparative Example 2)

In Example 3, the dispersion liquid concentration was 0.6 mass %, and except having adjusted the viscosity to 600 mPa*S, it carried out similarly to Example 3, and the comparative water purification agent 2 was produced.

Using the comparative dispersion liquid 2 in which the comparative water purification agent 2 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Comparative Example 2 are shown in Table 1-2.

(Example 7)

In Example 3, the dispersion liquid density|concentration was 0.08 mass %, and except having adjusted the viscosity to 150 mPa*S, it carried out similarly to Example 3, and produced the water purification agent 7.

Using the dispersion liquid 7 which disperse|distributed the water purification agent 7 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 7 are shown in Table 1-2.

(Example 8)

In Example 3, the dispersion liquid concentration was 0.4 mass %, and except having adjusted the viscosity to 450 mPa*S, it carried out similarly to Example 3, and produced the water purification agent 8.

Using the dispersion liquid 8 which disperse|distributed the water purification agent 8 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 8 are shown in Table 1-2.

(Comparative Example 3)

In Example 3, after pulverizing the dried product of the plant, by changing the conditions of the sieve at the time of classification, the median diameter of the solid content in the dispersion was adjusted to 80 µm, in the same manner as in Example 3, Purifying agent 3 was prepared.

Using the comparative dispersion liquid 3 in which the comparative water purification agent 3 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Comparative Example 3 are shown in Tables 1-3.

(Example 9)

In Example 3, after pulverizing the dried material of the plant, by changing the conditions of the sieve at the time of classification, it carried out similarly to Example 3 except having adjusted the median diameter of the solid content in a dispersion liquid so that it might become 120 micrometers, and the water purification agent 9 was produced.

Using the dispersion liquid 9 which disperse|distributed the water purification agent 9 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 9 are shown in Tables 1-3.

(Comparative Example 4)

In Example 3, after pulverizing the dried material of a plant, it carried out similarly to Example 3 except not performing classification, and the comparative water purification agent 4 was produced.

Using the comparative dispersion liquid 4 in which the comparative water purification agent 4 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Comparative Example 4 are shown in Tables 1-3.

(Reference Example 1)

Using the comparative water purifying agent 4 prepared in Comparative Example 4, in the same manner as in Example 1, the properties of the dispersion for water purification were evaluated. However, in Reference Example 1, the time left in the drum was set to 1 day (24 hours). The evaluation results of Reference Example 1 are shown in Tables 1-3.

(Example 10)

In Example 3, after pulverizing the dried material of the plant, by changing the conditions of the sieve at the time of classification, it carried out similarly to Example 3, except having adjusted the median diameter of the solid content in a dispersion liquid so that it might become 150 micrometers, and the water purification agent 10 was produced.

Using the dispersion liquid 10 in which the water purification agent 10 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 10 are shown in Tables 1-3.

(Example 11)

In Example 3, after pulverizing the dried material of the plant, by changing the conditions of the sieve at the time of classification, it carried out similarly to Example 3, except having adjusted the median diameter of the solid content in a dispersion liquid so that it might become 350 micrometers, and the water purification agent 11 was produced.

Using the dispersion liquid 11 which disperse|distributed the water purification agent 11 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 11 are shown in Tables 1-3.

(Example 12)

In Example 3, the dispersion liquid 12 was produced in the same manner as in Example 3 except that the water of the dispersion was changed to water having an electrical conductivity of 198 µS/cm (tap water in Kanuma City, Tochigi Prefecture).

Using the dispersion liquid 12, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 12 are shown in Tables 1-4.

(Example 13)

Dispersion 13 was prepared in the same manner as in Example 3, except that the water of the dispersion was changed to water having an electrical conductivity of 30 µS/cm, obtained by blending an appropriate amount of tap water and distilled water in Kanuma City, Tochigi Prefecture.

Using the dispersion liquid 13, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 13 are shown in Tables 1-4.

(Example 14)

In Example 3, classification of the plant and the polymer flocculant kneaded material was not performed. Other than that, it carried out similarly to Example 3, and produced the water purification agent 14.

Using the dispersion liquid 14 which disperse|distributed the water purification agent 14 in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 14 are shown in Tables 1-4.

(Example 15)

In Example 3, polyamine was used instead of polyacrylamide. Other than that, it carried out similarly to Example 3, and produced the water purification agent 15.

Using the dispersion liquid 15 in which the water purification agent 15 was disperse|distributed in water, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 15 are shown in Tables 1-4.

(Example 16)

In Example 3, the dispersion liquid 16 was produced in the same manner as in Example 3 except that the water of the dispersion was changed to water (distilled water) having an electrical conductivity of 1 µS/cm.

Using the dispersion liquid 16, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 16 are shown in Tables 1-4.

(Example 17)

In Example 3, a polymer flocculant and a plant powder were used individually, without producing a granulated product, and each was dispersed in water. In addition, as water of a dispersion liquid, distilled water was used. Other than that, it carried out similarly to Example 3, and produced the dispersion liquid 17.

Using the dispersion liquid 17, it carried out similarly to Example 1, and evaluated the characteristic of the dispersion liquid for water purification. The evaluation results of Example 17 are shown in Tables 1-4.

(Example 18)

As wastewater used for experiments, potassium fluoride was dissolved in pure water to prepare 800 g of an aqueous solution containing 2,500 mg/L fluoride ions (virtual drainage).

Then, 8.6 mg/L of calcium chloride was added to the waste water, and the mixture was stirred while adding sodium hydroxide so that the pH became 7.5 to 9.0 to insolubilize fluorine. By this operation, the aqueous fluorine solution was separated into a supernatant containing microflocs and a precipitate.

At this point, the ion concentration of the supernatant of the drain was 10 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 18 are shown in Tables 1-5.

(Example 19)

As wastewater used for experiments, ferric chloride/hexahydrate was dissolved in pure water to prepare 800 g of an aqueous solution containing 200 mg/L iron ions (virtual drainage).

Then, the water was stirred while adding sodium hydroxide to a pH of 6.5 to 9.0 to insolubilize iron.

At this point, the ion concentration of the supernatant of the drain was 2 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 19 are shown in Tables 1-5.

(Example 20)

As a wastewater used for an experiment, copper sulfate pentahydrate was melt|dissolved in pure water, and 800g of aqueous solutions containing a copper ion of 100 mg/L were produced (virtual drainage).

Then, it stirred, adding sodium hydroxide to the said waste_water|drain so that pH might be set to 7.0-8.0, and copper was insolubilized.

At this point, the ion concentration of the supernatant of the drain was 2 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 20 are shown in Tables 1-5.

(Example 21)

As wastewater used for experiments, zinc nitrate/hexahydrate was dissolved in pure water to prepare 800 g of an aqueous solution containing 100 mg/L zinc ions (virtual drainage).

Then, the waste water was stirred while adding sodium hydroxide to a pH of 9.0 to 9.5 to insolubilize zinc.

At this point, the ion concentration of the supernatant of the drain was 5 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 21 are shown in Tables 1-5.

(Example 22)

As waste water used for experiments, potassium dichromate was dissolved in pure water to prepare 800 g of an aqueous solution containing 100 mg/L of chromium ions (virtual drainage).

Then, to the waste water, sodium hydroxide was added and stirred so that the pH became 6.0 to 7.5 to insolubilize chromium.

At this point, the ion concentration of the supernatant of the drain was 5 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 22 are shown in Tables 1-5.

(Example 23)

As wastewater used for experiments, arsenic trioxide was dissolved in pure water to prepare 800 g of an aqueous solution containing 10 mg/L arsenic ions (virtual drainage).

Then, 65 mg/L of ferric chloride and 354 mg/L of calcium chloride were added to the drain, followed by stirring while adding sodium hydroxide to a pH of 8.0 to 9.5 to insolubilize arsenic.

At this point, the ion concentration of the supernatant of the drain was 0.05 mg/L.

In the same manner as in Example 3 except for using the wastewater, the dispersion liquid 3 in which the water purification agent 3 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated. The evaluation results of Example 23 are shown in Tables 1-5.

However, in Example 23, it carried out similarly to Example 3, after measuring the sedimentation time, the supernatant liquid was extract|collected, and after concentration so that the volume might be 1/100 with an evaporator, the ion concentration was measured. About the arsenic ion, 0.01 mg/L or less was judged as a preferable result, and it evaluated as (double-circle).

[Table 1-1]

[Table 1-2]

[Table 1-3]

[Table 1-4]

[Table 1-5]

As mentioned above, from the results of Examples 1 to 23, it was confirmed that the dispersion for water purification of the present invention exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and is a dispersion for water purification that can also satisfy low cost. could

Claims (11)

It is a dispersion liquid for water purification containing water and containing 0.01% by mass to 0.5% by mass of a combination of the powder of long jute and a polymer flocculant with respect to the water,
wherein the polymer flocculant is polyacrylamide,
A dispersion for water purification, wherein the dispersion has a viscosity of 20 mPa·S to 500 mPa·S, and a median diameter of a solid content in the dispersion for water purification is 100 μm to 400 μm. delete delete delete delete The dispersion liquid for water purification according to claim 1, wherein the mass composition ratio of the long jute and the polymer flocculant is 9:1 to 1:9. A method for producing a dispersion for water purification for preparing the dispersion for water purification according to claim 1 or 6, the method comprising:
A kneading process of mixing the powder of the long-cut jute and the polymer coagulant, adding moisture and kneading to obtain a kneaded product, a molding step of molding the kneaded material to form a compact, and drying the compact to obtain a dried product A method for producing a dispersion for water purification, comprising dispersing in water a powder of a water purification agent produced by a production method comprising a drying step to obtain and a pulverization step of pulverizing the dried product to prepare the dispersion for water purification. The method for producing a dispersion for water purification according to claim 7, wherein the electrical conductivity of water used for dispersion is 30 µS/cm or more. A wastewater treatment method comprising providing wastewater with the dispersion liquid for water purification according to claim 1 or 6 to remove inorganic unnecessary substances in wastewater. The wastewater treatment method according to claim 9, wherein the wastewater is wastewater containing an inorganic unnecessary material having at least any one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. The wastewater treatment method according to claim 10, wherein the dispersion for water purification is provided to wastewater after 24 hours or more have elapsed after preparation.

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